[RFC]: Add functions `guess_parse` and `guess_alphabet` #768

Job	Run time
test (1, ubuntu-latest, false)	3m 9s
test (1, macOS-latest, false)	2m 17s
test (1, windows-latest, false)	4m 29s
test (1.10, ubuntu-latest, false)	2m 13s
test (1.10, macOS-latest, false)	1m 35s
test (1.10, windows-latest, false)	3m 14s
test (nightly, ubuntu-latest, true, false)	3m 2s
	19m 59s

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